Influence of the emissivity of the sample on differential scanning calorimetry measurements

Wolfinger, Martin; Rath, Johannes; Krammer, Gernot; Barontini, Federica; Cozzani, Valerio

doi:10.1016/s0040-6031(01)00438-5

Cited by 20 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…33,43 The effect on the baseline was recognized to be the effect of radiative heat exchange, because of the different emissivity of the sample compared to that of the empty crucible in runs without a lid. 43 If crucibles without lids are used, the influence of heat radiation effects must also be considered. In this work, the radiative heat, Q rad , was calculated as the difference between the calculated Q char,s (eq 4) and the experimental heat flow from the residual char, Q char .…”

Section: Experimental Determination Of the Heat Of Pyrolysismentioning

confidence: 99%

See 1 more Smart Citation

Influence of Secondary Reactions on the Heat of Pyrolysis of Biomass

Gómez

Velo

Barontini

et al. 2009

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The thermal behaviors during the pyrolysis of two different biomass samples, beech wood from carpentry residuals and artichoke thistle from energy-dedicated crops, were investigated. Thermogravimetry/differential scanning calorimetry (TG-DSC) and thermogravimetry coupled to Fourier transform infrared (TG-FTIR) analysis of evolving products were used to investigate the thermal effects of the pyrolysis process. The role of pretreatments (hot-water washing, ethanol extraction, and their combination) was also analyzed. High alterations in the heat demand were observed as a function of the initial sample mass and pyrolysis conditions. The role of vapor-solid secondary interactions was evidenced by the evolution profiles of the main pyrolysis products.

show abstract

Section: Experimental Determination Of the Heat Of Pyrolysismentioning

confidence: 99%

“…However, in these runs, radiation heat flow effects did not need to be considered. 43 Thus, the Q rad correction was not required in these cases, and only Q s was subtracted from the experimental Q run curve.…”

Section: Experimental Determination Of the Heat Of Pyrolysismentioning

confidence: 99%

Influence of Secondary Reactions on the Heat of Pyrolysis of Biomass

Gómez

Velo

Barontini

et al. 2009

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…In the last decades, the development of the calorimetric methods resulted in constructing automated systems for thermodynamic analysis of materials based on the technique of differential scanning calorimetry (DSC). The most important disadvantage of the DSC systems, as applied for investigating wood-based panels, is mass of samples usually being less than 100 mg (e.g., Menczel et al 2009;Wolfinger et al 2001;Ghazi Wakili et al 2003). The low mass of samples has special significance in relation to large inhomogeneity of particles forming particleboard and OSB.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of wood-based panels: specific heat determination

et al. 2016

View full text Add to dashboard Cite

Ensuring reliability of data on thermal properties of wood-based panels is important for manufacturing processes, especially when it is recommended to shorten the cooling phase and stack the panels in hot conditions. Prediction of the heat transfer during cooling phase and normal or hot stacking based on accurate data is essentially important for attaining panels of required properties. The thermal properties are also required when designing houses, especially low-energy or passive ones. Therefore, a water calorimeter was adequately designed and constructed to ensure improvement in the accuracy of the specific heat measurements. The calorimeter was used to determine the specific heat. The attained accuracy estimated by the relative error was significantly increased, and the error values were less than 2 % for all types of the investigated particleboard and OSB. In case of low-density fiberboard (LDF), the maximum value of the relative error did not exceed 4 %. It was also shown that high accuracy required for the specific heat measurements was achieved for experiments in which high-mass samples were used, in contrast to measurements for such samples in traditional DSC systems. The results for the specific heat were within the range from 1420 to 1450 J/kg K for LDF and all types of particleboard. The effect of the investigated material density on the specific heat was not found. The only exception was in case of OSB for which the specific heat was ca. 1550 J/kg K, and it was approximately 100 J/kg K higher when compared to other panels.

show abstract

“…In a condition where the feedstock has a high composition in biomass, which has higher emissivity when changing to char as the volatile matter evolves, it could receive a higher amount of heat from the wall of the stirred tank reactor, compared to the plastic melt and bio-oil produced, which was mostly contributed to by the pyrolysis of biomass. Biomass char emissivity can reach 0.8 (Wolfinger et al, 2001). The reduction of bio-oil yield with increasing plastic composition in the feedstock was due to the decreased content of biomass in the feedstock to contribute to it; this also reduced the char yield.…”

Section: Tga Resultsmentioning

confidence: 99%

Improving Bio-oil Quality through Co-Pyrolysis of Corn Cobs and Polypropylene in a Stirred Tank Reactor

Supramono¹,

Jonathan²,

Haqqyana³

et al. 2016

IJTech

View full text Add to dashboard Cite

Bio-oil produced by biomass pyrolysis contains high oxygenates, namely, carboxylic acids, alcohols, and ketones resulting in low calorific fuel, and therefore bio-oil requires upgrading to sequester these oxygenates. By conducting the co-pyrolysis of biomass and plastic feed blend, the donation of hydrogen by plastic free radicals to the oxygen of biomass free radicals may sufficiently reduce oxygenate compounds in the bio-oil and increase its yield. Therefore, the synergetic effects are functional. Currently, co-pyrolysis reactors have high aspect ratios (ratio of height to diameter) of 4 or more and small diameters (maximum 40 mm), in which the heat transfer from the furnace to the feed blend is immaterial even though the plastic material has low thermal conductivity. However, in large-scale reactors, such a design restricts the bio-oil's capacity due to the heat transfer constraint. To resolve the latter and to improve bio-oil quality, in the present work, the co-pyrolysis of corn cobs and polypropylene (PP) is conducted in a stirred-tank reactor with a low aspect ratio (2). PP composition in the feed blend was varied from 0100% weight with a 12.5% weight interval, heating rate of 5 o C/min, and final temperature of 500 o C. The results show that by increasing the PP composition in the feed blend from 37.5% to 87.5%, the bio-oil yield increased from 25.8% to 67.2% feed weight. An analysis of bio-oil quality shows that there was a favorably abrupt increase of non-oxygenate composition in the bio-oil from less than 5% to more than 70% as the PP composition in the feed blend was increased from 37.5% to 50% and more.

show abstract

Influence of the emissivity of the sample on differential scanning calorimetry measurements

Cited by 20 publications

References 11 publications

Influence of Secondary Reactions on the Heat of Pyrolysis of Biomass

Influence of Secondary Reactions on the Heat of Pyrolysis of Biomass

Thermal properties of wood-based panels: specific heat determination

Improving Bio-oil Quality through Co-Pyrolysis of Corn Cobs and Polypropylene in a Stirred Tank Reactor

Contact Info

Product

Resources

About